What this MCCB is and what it does
The Siemens 3VA2325-7MN32-0HK0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) designed specifically for motor protection, with phase failure detection built in. It carries a continuous current rating of 250 A across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. The interrupting capacity reaches 330 kA at 240 V, stepping down to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 7.5 kA at 690 V. That SCCR headroom means it can be placed upstream in high-fault panels without cascading coordination issues. The trip delay is adjustable between 4 s and 17 s, giving the commissioning engineer room to coordinate with downstream motor-start curves. Auxiliary switching is handled by one auxiliary switch, one trip alarm switch, and one electrical alarm switch (HQ), plus a shunt trip (STL) release for remote tripping. Maximum power loss is 37.5 W — relevant for enclosure thermal budgeting in a packed panel.
Panel fit and mounting
The 3VA2325-7MN32-0HK0 measures 248 mm high, 138 mm wide, and 110 mm deep. Those dimensions are standard for the 3VA2 frame at this rating — it occupies the same footprint as other 250 A 3-pole variants in the series. The 110 mm depth is shallow enough to clear most 200 mm deep enclosures with room for rear-access wiring. Width of 138 mm means it fits a standard 3-pole cutout in a distribution board without special adapters.